JP2000024565A - Rotating roll type coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating apparatus capable of giving any desirable coating width and easily and reliably changing the coating width even during a coating work. SOLUTION: This coating apparatus for applying a coating liquid in a prescribed thickness to the surface of a coating roll 3 while moving a strip like sheet material 60 at a prescribed speed and transferring the coating liquid 61 on the coating roll 3 to the surface of the sheet material 60 comprises a first coating liquid removing mechanism 7 and a second coating liquid removing mechanism 8 comprising removing means 13, 16 so installed at a prescribed distance from each other on the circumferential face in both end parts of the coating roll 3 as to be moved on the coating roll 3 in the longitudinal direction of the coating roll 3 by driving means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary roll type coating apparatus provided with a coating liquid removing device for changing a coating width of a coating liquid on a rotary roll.

[0002]

2. Description of the Related Art Generally, synthetic resin films, metal foils, substrates, and the like are used to manufacture products such as magnetic recording media, thermal recording media, electrostatic recording media, printing paper such as carbonless paper, art paper, and coated paper. When a predetermined liquid (hereinafter, referred to as a coating liquid) is applied to a band-like sheet material such as paper, for example, Japanese Patent Application Laid-Open No.
A predetermined liquid is stored in a pan as described in JP-A-47704, and the liquid is applied to the surface of a sheet-like material being conveyed using a rotating roll in which a part of the roll surface is immersed in the liquid. A bread supply type roll coater for coating, or a pickup roll in which a predetermined liquid is contained in a pan as described in JP-A-10-57862 and a part of the roll surface is immersed in the liquid. The offset roll is contacted to move the liquid on the pickup roll to the offset roll, and then the coating roll is brought into contact with the offset roll to transfer the liquid on the offset roll to the coating roll, and the sheet being conveyed by the coating roll For reverse coating type roll coater for applying liquid to the surface of solids or for supplying coating liquid Rotating roll type coating apparatus of a roll coater or the like of the reverse coating method fountain head in place of the pan is installed is used.

In the above-mentioned rotary roll type coating apparatus, the sheet material coated with the coating liquid is transferred to a processing step such as drying. In order to prevent the coating liquid to be applied from adhering to the surface of the transfer roll, uncoated portions of several mm to several tens mm are provided at both ends during coating.

In order to form the uncoated portion, the length of the coating liquid applying roll of the offset roll is made shorter than the length of the coating liquid applying roll of the coating roll to reduce the width of the coating liquid. The wedge-shaped support member 50 as shown in FIGS. 12 and 13 raises the widthwise end of the sheet-like material 60 by a predetermined amount so as not to come into contact with the coating liquid 61 on the coating roll 51.

[0005] In the former method in which the coating width is changed by changing the length of the offset roll, several types of rolls must be prepared depending on the type of product, and time is lost for replacement and restarting operation. And the cost of replacement and the like, and the problem that the coating width cannot be changed during the coating operation.

In the latter method of lifting the end of the sheet-like object by the support member 50, the support member 50
Therefore, there is a problem that abrasion and wrinkles are generated on the sheet-shaped material 60, and a problem that the coating position (coating width) cannot be constant when the coating roll and the sheet-shaped material 60 are not in contact with each other.

Therefore, in order to solve these problems, a coating liquid is prevented from being applied to both ends of a coating roll by a predetermined width as described in JP-A-5-31424. There has been proposed a coating apparatus having a configuration in which a thin plate for regulating the coating position is provided.

In the case where such a thin plate for regulating the coating position is provided, there is no problem when the coating liquid supplied to the coating roll is transferred to the sheet as it is, but there is no problem. When a doctor blade or a metering roll is brought into contact with the coating liquid to remove the excess coating liquid in order to keep the thickness constant, the removed coating liquid supplies the coating liquid for the coating roll. It will move to the place where it did not and will adhere. for that reason,
There is a problem that it is not possible to reliably control the position of the coating location, and the coating end face is in a meandering state, which is not sufficiently satisfactory.

It is an object of the present invention to provide a coating apparatus which can realize an arbitrary coating width and can easily and surely change the coating width even during operation. .

[0010]

In order to achieve the above-mentioned object, a coating capable of moving at a predetermined interval on an end circumferential surface of a rotating roll and in a longitudinal direction of the rotating roll as described in claim 1 is provided. A liquid removing mechanism is provided.

Further, in the coating apparatus of the present invention, the removing means in the coating liquid removing mechanism is provided in a nozzle for sucking the coating liquid as in claim 2, and in a suction roll as in claim 3, The nozzle which blows air to a coating liquid part and suctions a coating liquid as described in claim 4 can be provided.

[0012]

FIG. 1 is a schematic perspective view showing one embodiment of the configuration of a rotary roll type coating apparatus according to the present invention, and FIG.
3, FIG. 3 is a schematic plan view of FIG. 2, FIG. 4 is a sectional view taken along the line II in FIG. 2, and FIG. 5 is an enlarged sectional view of a nozzle portion in FIG. Is machine frame 1-1,
1-2 has a pan 2 for holding a coating liquid mounted in a horizontal state and a toothed pulley 5 for rotation driving at an end.
1, a coating roll 3 rotatably supported by bearings 4 on a 1-2, a doctor blade 6 for adjusting the amount of coating liquid attached to the coating roll 3, and a doctor blade 6 located downstream of the doctor blade 6. The coating roll 3
And a first coating liquid removing mechanism 7 installed on the right end of the coating roll 3 so as to have a predetermined interval, and a first coating liquid removing mechanism 7 on the left end of the coating roll 3 so as to have a predetermined interval. It has a second coating liquid removing mechanism 8, a separator 10 for separating the coating liquid and air, and a suction fan 11, and has a first coating liquid removing mechanism 7 and a second coating liquid removing mechanism 8. It comprises a connected suction pipe 9 and a storage tank 12 for storing the coating liquid separated by the separator 10.

The coating roll 3 is a drive mechanism (not shown) such as a toothed pulley attached to an output shaft of an electric motor or a variable speed machine, and a toothed belt stretched over the toothed pulley and the toothed pulley 5. Is rotated at a predetermined speed. The rotation direction of the coating roll 3 is set to the same direction as the traveling direction of the sheet-like material or the opposite direction depending on the traveling speed of the sheet-like material, the viscosity of the coating liquid, the coating thickness, and the like.

The first coating liquid removing mechanism 7 comprises a removing means 13, a moving means 14, and a removing auxiliary member 15,
The coating liquid removing mechanism 8 includes a removing unit 16, a moving unit 17, and a removing auxiliary member 18.

The removing means 13 comprises a suction box 20 having a rectangular cross section and a suction nozzle 2 having a suction port which is horizontally long in the horizontal direction.
The suction tube 20 is connected to the suction box 20. The suction tube 9 is preferably connected to a position where no coating liquid remains in the suction box 20. Further, the suction port of the suction nozzle 21 is 0.5 to 2.0 mm with respect to the peripheral surface of the coating roll 3.
Suction box 2 so as to have a predetermined interval and a predetermined angle.
0 is attached to the moving means 14.

The moving means 14 has a bracket 22 attached to the machine frame 1-1 so that the guide rail 22a formed on the upper surface is horizontal, and the bracket 22 is rotatable in a state parallel to the guide rail 22a. Screw shaft 23 attached to the screw shaft, and a female screw portion 24a screwed to the screw shaft 23
A movable support member 24 attached to the bracket 22 so as to be movable along the guide rail 22a, a differential gear box 25 attached to an end of the screw shaft 23, and an output of the differential gear box 25. Handle 26 attached to shaft
The suction box 20 of the nozzle 19 is mounted on the movable support member 24.

By rotating the handle 26 forward or backward, the nozzle 19 together with the movable support member 24 is moved longitudinally along the circumferential surface of the coating roll 3 to adjust the removal position of the coating liquid ( Adjust the coating width.)
It has become. Instead of the handle 26, it is possible to attach a forward or reverse rotating electric motor or the like.

The removal assisting member 15 sucks the coating liquid on the coating roll 3 from the suction port of the suction nozzle 21 so that air is not sucked as much as possible from the suction port not located on the peripheral surface of the coating roll 3. And has an arc-shaped plate portion having substantially the same shape as the circumferential surface of the coating roll 3, and has almost no gap with the end surface of the coating roll 3 so as to form an extension of the circumferential surface of the coating roll 3. It is attached to the machine frame 1-1 in the state.

Removal means 1 in second coating liquid removal mechanism 8
6. The moving means 17 and the removal assisting member 18 have a configuration opposite to that of the removing means 13, the moving means 14 and the removal assisting member 15 in the first coating liquid removing mechanism 7, and are partially different in the length dimension of the bracket. Other than that, the configuration is the same, and the description is omitted.

When the coating liquid is applied to the sheet by the above-mentioned rotary roll type coating apparatus, the handle 26 of the first coating liquid removing mechanism 7 is determined based on the coating width of the sheet.
Is turned to move the nozzle 19 together with the movable support member 24 to a predetermined position, and then the handle 26 of the second coating liquid removing mechanism 8 is turned to move the nozzle 19 together with the movable support member 24 to a predetermined position. Before or after the operation, a predetermined coating liquid 61 is supplied to the pan 2, the coating roll 3 is rotated to cause the coating liquid 61 to adhere to the circumferential surface of the coating roll 3, and the gap size of the doctor blade 6 is reduced. The amount of the coating liquid on the circumferential surface is adjusted to a predetermined amount by adjustment.

When these preparations are completed, the coating roll 3 is rotated and the fan 11 is operated to generate a suction force on the suction box 20 of the nozzle 19 and the suction nozzle 21.

Then, the coating liquid 61 located at the suction port of the suction nozzle 21 out of the coating liquid 61 attached to the circumferential surface of the coating roll 3 is sucked by the suction nozzle 21. The coating liquid 61 sucked together with the air is separated from the air and the coating liquid 61 in the separator 10, and the separated coating liquid 61 is stored in the storage tank 12. The coating liquid 61 stored in the storage tank 12 is returned to the pan 2 for reuse. In this case, when a filter for removing impurities in the coating liquid, a liquid feeding pump, a gate valve and the like are provided between the storage tank 12 and the pan 2, the liquid can be automatically sent.

The coating liquid 6 on the above-mentioned coating roll 3
When the sheet-like material 60 is run at a predetermined speed in a state where 1 is adjusted to a predetermined width, the coating liquid 61 on the coating roll 3 is transferred to the surface of the sheet-like material 60.

Instead of the nozzles 19 of the above-mentioned removing means 13 and 16, compound nozzles 27 and 28 as shown in FIGS. 6, 7 or 8, and suction rolls as shown in FIGS. 9, 10 and 11. 29, a flexible doctor blade for scraping made of synthetic resin, synthetic rubber, or the like, a fixed brush, a rotary brush made of synthetic resin, or the like, or a configuration in which these are appropriately combined.

The composite nozzle 27 has a shape having a compressed air injection port 27a and a suction port 27b, and a compressed air supply having a pressure control valve, an electromagnetic switching valve, etc. (not shown) at the compressed air injection port 27a. Pipe 30 is connected, and the suction port 27b is connected to the separator 3 as in the case of the nozzle 19.
2 is connected to the suction tube 31. The compressed air supply pipe 30 is connected to the exhaust port of the fan 33, and the suction pipe 31 is connected to the suction port of the fan 33. The dimensions and shapes of the compressed air injection port 27a and the suction port 27b are set according to the type and viscosity of the coating liquid, the rotation speed of the coating roll, and the like. It is possible to provide an ultrasonic oscillator instead of the compressed air supply tube 30.

The composite nozzle 28 is formed of a synthetic resin or the like, and is rotated by a motor or the like.
Are provided in the suction nozzle 34.

The suction roll 29 includes a roll body 36 rotatably mounted on a bracket 37 by a bearing 38, and a pad 3 wound on the peripheral surface of the roll body 36.
9 and a rotary joint 40 attached to the end shaft of the roll body 36,
Is attached to the movable support member 24.

The roll body 36 has a suction hole 3 at its shaft center.
6a, and a plurality of suction holes 3 communicating with the suction holes 36a and the peripheral surface of the roll body 36.
6b is drilled. As in the case of the nozzle 19, a suction pipe 41 having a separator, a fan, and the like is connected to the rotary joint 40. The pad 39 is made of a nonwoven fabric of a natural fiber or a synthetic fiber, a sponge of a natural or synthetic resin, a porous body having a liquid absorption and permeability such as a porous sintered alloy. The suction roll 29 can be configured to be rotated by contact with the coating roll 3 or configured to be rotated by a driving device such as an electric motor.

Further, when a rotary brush, a fixed brush or a flexible doctor blade and a suction nozzle are provided side by side, the coating liquid can be more surely removed by suction due to a synergistic effect.

[0030]

According to a first aspect of the present invention, there is provided a rotating roll type coating apparatus, wherein the coating liquid is movable on a circumferential surface of an end portion of the rotating roll at a predetermined interval and in a longitudinal direction of the rotating roll. Since the removal mechanism is provided, a desired coating width can be realized, and the coating width can be easily and reliably changed even during operation. Further, since the surface of the rotating roll is not in contact with the coating liquid removing means, the roll can be rotated at a high speed, and the coating processing speed can be increased.

Further, in the rotating roll type coating apparatus of the present invention, when the removing means in the coating liquid removing mechanism is a nozzle for sucking the coating liquid, the coating liquid is reliably sucked. The coating liquid can be prevented from being scattered, and the coating liquid can be reused. If the removing means in the coating liquid removing mechanism is a suction roll as described in claim 3, the surface of the rotating roll can be prevented. Since the suction force acts directly on the coating liquid, the coating liquid can be reliably removed, and the removing means in the coating liquid removing mechanism blows air onto the coating liquid portion and sucks the coating liquid. When a nozzle is used, even when the rotating roll has a concave portion on the peripheral surface, such as a gravure roll, the coating liquid can be lifted from the concave portion and reliably removed by suction.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing one embodiment of a rotary roll type coating apparatus of the present invention.

FIG. 2 is a schematic front view of FIG.

FIG. 3 is a schematic plan view of FIG. 2;

FIG. 4 is a view taken in the direction of an arrow II in FIG. 2;

FIG. 5 is an enlarged sectional view of a nozzle portion in FIG.

FIG. 6 is a schematic perspective view showing one embodiment when a composite nozzle is used as a removing means in a coating liquid removing mechanism.

FIG. 7 is a view taken in the direction of arrows II-II in FIG. 6;

FIG. 8 is a schematic sectional view showing another embodiment of the composite nozzle.

FIG. 9 is a schematic perspective view showing one embodiment when a suction roll is used as a removing means in the coating liquid removing mechanism.

FIG. 10 is an enlarged view of a suction roll portion in FIG.

11 is a view taken in the direction of arrows III-III in FIG. 10;

FIG. 12 is a schematic front view showing one embodiment of a coating width adjusting mechanism in a conventional rotary roll type coating apparatus.

13 is a view taken in the direction of arrows IV-IV in FIG.

[Explanation of symbols]

 1-1, 1-2 Machine frame 2 Pan 3 Coating roll 6 Doctor blade 7 First coating liquid removing mechanism 8 Second coating liquid removing mechanism 9, 31, 41 Suction tube 10, 32 Separator 11, 33 Fan 12 Storage tanks 13, 16 Removal means 14, 17 Driving means 15, 18 Removal auxiliary member 19 Nozzle 20 Suction box 21, 34 Suction nozzle 22, 37 Bracket 23 Screw shaft 24 Movable support member 25 Operating gear box 26 Handle 27, 28 Composite Nozzle 29 Suction roll 30 Compressed air supply tube 35 Rotating brush 36 Roll body 39 Pad 27a Compressed air injection port 27b Suction port

Claims (4)

[Claims] 1. A coating liquid having a predetermined thickness is adhered to the surface of a rotating roll, and a strip-shaped sheet is caused to run at a predetermined speed, and the coating liquid on the rotating roll is coated on the surface of the sheet. In a coating apparatus to be transferred, a rotary roll type wherein a coating liquid removing mechanism movable at a predetermined interval on an end circumferential surface of the rotary roll and movable in a longitudinal direction of the rotary roll is provided. Coating equipment. 2. The method according to claim 1, wherein the removing means in the coating liquid removing mechanism is a nozzle for sucking the coating liquid.
2. A rotary roll type coating apparatus according to item 1. 3. The rotary roll type coating apparatus according to claim 1, wherein the removing means in the coating liquid removing mechanism is a suction roll. 4. The rotary roll type coating according to claim 1, wherein the removing means in the coating liquid removing mechanism is a nozzle for blowing air to the coating liquid portion and sucking the coating liquid. apparatus.